TM 5-3810-288-12
air brake system. Place the lever in the RELEASED
light will turn on when oil pressure is below the safe
position for normal operation. Place the lever in the
maximum.
(4) Water temperature warning light. This light
EMERGENCY position for short term parking. Place the
will turn on when water temperature is above the safe
lever in the PARK position for long term parking. Refer
to paragraph 6-8 for a more complete description of
maximum.
brake system operation.
(5) Engine oil pressure gauge. This gauge
(17) Starting aid. Push this lever three or four
indicates the oil pressure in the carrier engine. Normal
strokes to inject engine fuel into the engine intake
oil pressure is 40 psi, with an acceptable variations of 5
manifold to assist in starting the carrier engine in cold
psi above or below.
(6) Left turn directional lamp. This lamp will
weather. Wait about five second after injecting the fuel
before attempting to start the engine.
"blink" when the directional turn lever is pulled downward
(18) Inter-axle differential lockout. When very
to signal a left turn.
(7) Speedometer/odometer.
slippery road conditions are encountered, or when very
This instrument
bumpy off-road conditions are en-countered, depress
indicates the carrier speed in miles per hour and
this push-button and hold it depressed for maximum
accumulated total carrier mileage.
traction. This control should be used only when really
(8) High beam indicator. This lamp is illuminated
necessary, since it imposes extra strain on axle
when the carrier headlights are on high beam.
mechanisms.
(9) Tachometer/hour-meter.
This instrument
(19) Dry road-slippery road switch. Place this
indicates engine speed in hundreds of revolutions per
lever in the SLIPPERY ROAD position when slippery
minute and accumulated engine operating time in hours.
driving conditions are encountered. This will reduce air
(10) Right turn directional lamp. This lamp will
brake pressure to front wheel service brakes by 50 per
"blink" when the directional turn lever is pulled downward
cent, thus assisting in pre-venting skidding. Return to
to signal a left turn.
the DRY ROAD position as soon as conditions will allow.
(11) Air pressure gauge. This gauge indicates
(20) Windshield wiper switch. This switch turns
air pressure in the air brake system in pounds per square
the windshield wipers on and off.
inch (psi).
(21) Fuel level gauge. This gauge indicates the
(12) Park abort control This control is used to
remaining amount of fuel in the fuel tank.
drain down air pressure in the air brake system and
(22) Panel lamp. Turn to illuminate panel.
maintain the brake shoes out of contact with the brake
(23) Panel lamp. Turn to illuminate panel.
drums for long term parking when it is necessary to be
(24) Water temperature gauge. This gauge
sure brake shoes do not freeze to brake drums. See the
indicates water temperature in degrees Fahrenheit
description of operation in paragraph 6-8.
Normal temperature, while running, is between 160 and
(13) Engine throttle control. Pull out on this
200 degrees.
control to increase engine idle speed. Push in on the
(25) Cab heater switch. Turn this switch to start
control to decrease engine speed.
the cab heater.
(14) Reservoir drain valve. Depress and hold
(26) Panel lamp. Turn to illuminate panel.
this valve depressed to drain all air pressure from the air
(27) Battery-generator indicator. This device is a
brake reservoir. Refer to para-graph 6-8.
voltmeter and is designed to indicate the condition of the
(15) Tractor protection valve. This valve is used
battery and to assist in diagnosing other troubles. Refer
only ,when towing another vehicle, and should not be
to figure 2-37 for further information.
pushed in when another vehicle is not being towed. In
(28) Ignition switch. Turn this switch clock-wise
normal towing service, push the valve in.
In an
to turn on the engine ignition.
Turn the switch
emergency, if it becomes necessary to apply the brakes
counterclockwise to turn the ignition off.
of the towed vehicle, pull this valve out.
(29) Hazard warning switch light. This light will
(16) Emergency park release lever. This ever
blink when the hazard warning switch (item
selects the basic mode of operation of the
30) is turned on.
6-2
